199820718 has 12 divisors (see below), whose sum is σ = 432944928. Its totient is φ = 66606900.

The previous prime is 199820713. The next prime is 199820773. The reversal of 199820718 is 817028991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199820713) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5550558 + ... + 5550593.

It is an arithmetic number, because the mean of its divisors is an integer number (36078744).

Almost surely, 2^199820718 is an apocalyptic number.

199820718 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

199820718 is an abundant number, since it is smaller than the sum of its proper divisors (233124210).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

199820718 is a wasteful number, since it uses less digits than its factorization.

199820718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11101159 (or 11101156 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 45.

The square root of 199820718 is about 14135.7956267060. The cubic root of 199820718 is about 584.6287541539.

The spelling of 199820718 in words is "one hundred ninety-nine million, eight hundred twenty thousand, seven hundred eighteen".